PCA9535BS1,118 Equivalent & Substitute Parts

Part Overview

The PCA9535BS1,118 is a 16-bit I/O Expander with I2C and SMBus interface operating at 400 kHz, manufactured by NXP USA Inc. in a 24-HWQFN (4x4) package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part provides push-pull output configuration with interrupt output capability and operates across a 2.3V to 5.5V supply voltage range.

Substiute Parts

PCA9535BS1,118

NXP USA Inc.In Stock: 993PCA9535BS1,118 Datasheet

Current PartRFQ

TCA9535MRGER

Texas InstrumentsIn Stock: 60447TCA9535MRGER Datasheet

MFR RecommendedRFQ

TCA9535RGER

Texas InstrumentsIn Stock: 24640TCA9535RGER Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9535BS1,118 are qualified based on the following electrical and mechanical parameters:

Core Functional Parameters:

• Number of I/O: 16 bits
• Interface Protocol: I2C and SMBus compatible
• Clock Frequency: 400 kHz operation
• Output Configuration: Push-Pull topology
• Current Capability: 10mA source / 25mA sink minimum
• Supply Voltage Range: Must support the operational envelope
• Operating Temperature Range: -40°C to 85°C
• Interrupt Output: Present
• Features: Power-On Reset (POR)

Package Compatibility: The original 24-HWQFN (4x4) package may be substituted with 24-VQFN (4x4) packages, as both are 24-pin QFN variants with identical pin counts and compatible footprints for surface mount applications.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and EAR99 export classification to ensure regulatory continuity.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes: TCA9535MRGER and TCA9535RGER (Texas Instruments)

Both Texas Instruments TCA9535 variants are direct functional equivalents to the PCA9535BS1,118. The TCA9535MRGER and TCA9535RGER maintain identical electrical specifications for I/O count, interface protocol, clock frequency, output configuration, and current drive capability. Both parts are in active production status, ensuring long-term availability and supply chain continuity.

The TCA9535 series offers an extended lower supply voltage limit of 1.65V compared to the NXP part's 2.3V minimum, providing additional design flexibility for low-voltage applications. Both substitute parts maintain full ROHS3 compliance and EAR99 classification.

Package transition from 24-HWQFN to 24-VQFN represents a standard industry practice for QFN variants. Both packages are 24-pin surface mount configurations with identical pin pitch and compatible PCB footprints.

The primary distinction between TCA9535MRGER and TCA9535RGER is packaging format: TCA9535MRGER is supplied in Cut Tape and Digi-Reel format with 60,400 units in stock, while TCA9535RGER is also supplied in Cut Tape and Digi-Reel format with 24,613 units in stock. Selection between these variants depends on procurement volume and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can the TCA9535MRGER or TCA9535RGER directly replace the PCA9535BS1,118 without PCB modifications?

A: The TCA9535 series maintains functional equivalence across all critical electrical parameters. Package transition from 24-HWQFN to 24-VQFN requires PCB footprint verification, as both are 24-pin QFN variants with identical pin counts but may have minor dimensional differences. Consult package datasheets for precise footprint specifications before PCB layout finalization.

Q: What is the significance of the extended lower voltage range (1.65V vs. 2.3V) in the TCA9535 substitutes?

A: The TCA9535 series supports operation down to 1.65V supply voltage, whereas the PCA9535BS1,118 requires a minimum of 2.3V. This extended range provides design flexibility for applications requiring lower supply voltages. Existing designs operating at or above 2.3V experience no functional impact from this specification difference.

Q: Are there compatibility concerns with I2C and SMBus protocol implementation between NXP and Texas Instruments parts?

A: Both the PCA9535BS1,118 and TCA9535 series implement I2C and SMBus protocols at 400 kHz clock frequency with identical functional specifications. No protocol-level compatibility issues exist between manufacturers for this interface standard.

Q: What is the impact of the different Moisture Sensitivity Levels (MSL 1 vs. MSL 2)?

A: The PCA9535BS1,118 carries MSL 1 (unlimited shelf life), while TCA9535 variants carry MSL 2 (1-year shelf life). MSL 2 components require controlled storage conditions and have a defined moisture sensitivity window. For applications with extended component storage requirements, verify storage protocols align with MSL 2 specifications.

Q: How do the output current specifications compare between the original and substitute parts?

A: All three parts maintain identical output current specifications: 10mA source and 25mA sink capability. No design modifications are required to accommodate current drive differences.

Q: What is the relationship between the TCA9535MRGER and TCA9535RGER variants?

A: Both parts are functionally identical Texas Instruments I/O expanders with the same electrical specifications and package configuration. The designation difference reflects packaging format and supplier reel configuration. Selection depends on procurement volume and supply chain logistics rather than technical performance.